Two technicians are explaining the information on a repair order. technician a says that the cause written on the repair order is a diagnosis. technician b says that you need to document or write what was done to correct the concern and cause. which technician is correct? a. technician a only b. neither technician a nor b c. technician b only d. both technicians a and b

Technician A and B are correct . Because according to technician A, the cause written on the repair order is a diagnosis. Here, by diagnosis, he means that the problem is identified after examining the device and hence the judgement is made.
And according to B, you have to write the cause of the problems in the device that have been identified and the concern measures, which is also kind of diagnosis.

So, option D is correct.